public override void OnMouseDown(CellContext sender, MouseEventArgs e)
{
base.OnMouseDown(sender, e);
var pressed = e.Button & MouseButtons;
if (pressed == MouseButtons.None)
{
return;
}
//[email protected]: Remember the point where the mouse down occurred. The DragSize indicates
// the size that the mouse can move before a drag event should be started.
Size dragSize = SystemInformation.DragSize;
// [email protected]: Create a rectangle using the DragSize, with the mouse position being
// at the center of the rectangle.
m_DragSizeRectangle = new Rectangle(
new Point(e.X - SystemInformation.DragSize.Width / 2,
e.Y - SystemInformation.DragSize.Height / 2), dragSize);
GridVirtual grid = sender.Grid;
//[email protected]: To Fix autoscrolling issue on pressing shift and then moving mouse
//after releasing shift
Range rg = new Range(sender.Position);
bool inRange = false;
if (grid.Selection.GetSelectionRegion() != null && grid.Selection.GetSelectionRegion().GetCellsPositions().Count > 1)
{
inRange = grid.Selection.GetSelectionRegion().IntersectsWith(rg);// return;
}
//Check the control and shift key status
bool controlPress = ((Control.ModifierKeys & Keys.Control) == Keys.Control &&
(grid.SpecialKeys & GridSpecialKeys.Control) == GridSpecialKeys.Control);
bool shiftPress = ((Control.ModifierKeys & Keys.Shift) == Keys.Shift &&
(grid.SpecialKeys & GridSpecialKeys.Shift) == GridSpecialKeys.Shift);
//[email protected]: Defect Fix - After using Shift to select continuous cells
//click on one of the selected cell to initate drag and drop, this will reset
//the selection. To avoid resetting of selection and enable autoscrolling.
if (!shiftPress && !controlPress && inRange)
{
grid.Focus();
if (grid.Selection.EnableDragSelection)
{
//[email protected]: this condition is necessary for
//excel like selection in dataGrid
grid.Selection.ResetSelection(true);
grid.Selection.Focus(sender.Position, true);
}
/*[email protected]: when change is made to accomodate FreezePanes,
* //scrolltracking should be enabled to the whole dataArea. and not just scrollrect */
// begin scroll tracking only if mouse was clicked
// in scrollable area
Rectangle scrollRect1 = grid.GetDataArea();
if (scrollRect1.Contains(e.Location))
{
BeginScrollTracking(grid);
}
grid.Selection.Invalidate();
return;
}
//Default click handler
if (shiftPress == false ||
grid.Selection.EnableMultiSelection == false)
{
//Handle Control key
bool mantainSelection = grid.Selection.EnableMultiSelection && controlPress;// && inRange;
//If the cell is already selected and the user has the ctrl key pressed then deselect the cell
if (controlPress && grid.Selection.IsSelectedCell(sender.Position) && grid.Selection.ActivePosition != sender.Position)
{
grid.Selection.SelectCell(sender.Position, false);
}
else
{
grid.Selection.Focus(sender.Position, !mantainSelection);
}
}
else //handle shift key
{
//[email protected]: on pressing ctrl and then using shift it resets the selection - to avod this
//grid.Selection.ResetSelection(true);
Range rangeToSelect = new Range(grid.Selection.ActivePosition, sender.Position);
grid.Selection.SelectRange(rangeToSelect, true);
}
/*[email protected]: when change is made to accomodate FreezePanes,
* //scrolltracking should be enabled to the whole dataArea. and not just scrollrect */
// begin scroll tracking only if mouse was clicked
// in scrollable area
Rectangle scrollRect = grid.GetDataArea();
if (scrollRect.Contains(e.Location))
{
BeginScrollTracking(grid);
}
grid.Selection.Invalidate();
}